Member Avatar for HrishiR

I require some help regarding image comaprison application!!

I am devloping Image Comparison Application in ASP.net which compares images irrespective of it's format,size and gives result in Percentage Format!!
I want to know whether it's possible to comapre 2 images using asp.net irrespective of their format,size and result should be in percenatge format like 80%-90% like that...And the criterias for comparison are not "image size,pixel by pixel comparison and height,width". But they are other than this!! Can anyone suggest criterias for such comparison?....

Is anyone successfull in finding same images irrespective of their format,size or have faced the same problem?...

Example:
**say there is a yellow rose picture and another with red rose picture
**then similarity is 99%
**irrespective of the height and width of the images

Can anyone please help me in this matter.It would be really appreciated if anyone give some good links along with some sample code that anyone would have got while working on such application. It's very much like a research topic.Most of stuff i got was research one & not related to programming pt. of view..

thanks hrishi

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It is possible to produce a "percentage" similarity in ASP.NET, but the number depends entirely on which differences you want to ignore (resize, crop, rotation, color, illumination). For the "yellow rose vs red rose = 99%" goal you must favor structural/semantic features over raw color or pixel equality so colour changes do not dominate the score.

Common, practical approaches you can prototype (ordered from simple/fast to more robust/expensive):

  • Perceptual hashes (aHash / dHash / pHash): create a fixed-length fingerprint, compute Hamming distance d. Convert to percent as (1 - d / hashLength) * 100. Fast and good for resizing, not for big rotations/crops.
  • Color histograms (HSV, normalized): compare with correlation or Bhattacharyya distance. Good for color similarity; avoid if you want color-invariance.
  • Keypoint descriptors (ORB / SIFT / AKAZE): detect+describe keypoints, match with ratio test, count "good matches". Convert to percent by comparing goodMatches to average keypoints. Robust to scale/rotation and partial occlusion.
  • SSIM (Structural Similarity): returns 0..1; multiply by 100. Good for perceptual/image-quality similarity, not object recognition.
  • Deep CNN embeddings: get vectors from a pretrained network and use cosine similarity. Best for semantic/object-level similarity (rose vs rose regardless of color).

Implementation notes for ASP.NET: use a native library wrapper (EmguCV/OpenCvSharp) or ONNX/ML.NET for embeddings. Workflow: normalize sizes, optional grayscale/histogram-eq, compute descriptor/embedding, compare metric -> map to percent, then calibrate thresholds on a labeled sample set. Start with pHash/ORB for quick prototypes and move to CNN embeddings only if you need semantic robustness. ’s pointer to a CodeProject article is a useful starting reference; ’s point about complexity is valid — iterate and validate with real examples.

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Member Avatar for f1 fan

I am devloping Image Comparison Application in ASP.net which compares images irrespective of it's format,size and gives result in Percentage Format!!

I want to know whether it's possible to comapre 2 images using asp.net irrespective of their format,size and result should be in percenatge format like 80%-90% like that...And the criterias for comparison are not "image size,pixel by pixel comparison and height,width". But they are other than this!! Can anyone suggest criterias for such comparison?....

So you arent developing one. You want someone to do it all for you?

Notwithstanding that. Have you any idea on the complexity of the task? Before i go into too much depth - what is your level of programming capability? For a start do you know how images are stored?

Member Avatar for floydus

So you arent developing one. You want someone to do it all for you?

Notwithstanding that. Have you any idea on the complexity of the task? Before i go into too much depth - what is your level of programming capability? For a start do you know how images are stored?

What a rude answer, I'm also looking for the same, I have developped something but in vb6... :sad: Now looking for something efficient in .NET, C# in fact.

Member Avatar for kk.badboy

I require some help regarding image comaprison application!!

I am devloping Image Comparison Application in ASP.net which compares images irrespective of it's format,size and gives result in Percentage Format!!
I want to know whether it's possible to comapre 2 images using asp.net irrespective of their format,size and result should be in percenatge format like 80%-90% like that...And the criterias for comparison are not "image size,pixel by pixel comparison and height,width". But they are other than this!! Can anyone suggest criterias for such comparison?....

Is anyone successfull in finding same images irrespective of their format,size or have faced the same problem?...

Example:
**say there is a yellow rose picture and another with red rose picture
**then similarity is 99%
**irrespective of the height and width of the images

Can anyone please help me in this matter.It would be really appreciated if anyone give some good links along with some sample code that anyone would have got while working on such application. It's very much like a research topic.Most of stuff i got was research one & not related to programming pt. of view..

thanks hrishi

hi dost!!

i am also searching for same. If you got any success than please help me.

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